How many compartments are in the hand?

The hand is comprised of eleven separate compartments. These are the four dorsal interossei, three volar interossei, the thenar, the hypothenar, the adductor, and the mid-palm compartments, respectively.

What types of muscles are in the hand?

Hand Muscles

• Interossei (dorsal and palmar) The interossei muscles begin between the bones of the hand.
• Hypothenar.
• Thenar.
• Lumbricals.
• Adductor Pollicis.
• Abductor pollicis longus.
• Biceps.
• Brachialis.

Where are the muscles in your hand?

They are called extrinsic because the muscle belly is located on the forearm. The intrinsic group are the smaller muscles located within the hand itself. The muscles of the hand are innervated by the radial, median, and ulnar nerves from the brachial plexus….

What are the forearm compartments?

There are four compartments of the forearm: dorsal, superficial volar, deep volar, and the mobile wad.

What are dorsal compartments in hand?

The dorsal extensor tendons pass under an extensor retinaculum and are divided into 6 compartments, as follows: Radial wrist abductor (abductor pollicis longus tendon) and thumb extensor (extensor pollicis brevis tendon) dorsal to the trapezium bone. Extensor digiti minimi tendon to the fifth digit.

How many extensor compartments are there in the hand?

6 compartments
There are a whole lot of wrist/finger extensors trying to fit in the wrist and anatomically these are divided into 6 compartments.

How many muscles are there in hand?

Hand Anatomy. The human hand is made up of the wrist, palm, and fingers and consists of 27 bones, 27 joints, 34 muscles, over 100 ligaments and tendons, and many blood vessels and nerves.

What are the parts of your hand?

Parts of a Hand

• Bones are hard tissues that give your hand shape and stability.
• Phalanges are the finger bones.
• Metacarpals are the middle part of the hand bones.
• Carpals are the wrist bones.
• Joints are places where bones fit together, allowing movement.

How many muscles are in your hand and wrist?

What is flexor compartment?

The superficial compartment of the flexor surface of the forearm contains the pronator teres, the flexor carpi radialis longus, the palmaris longus, the flexor carpi ulnaris, and the flexor digitorum superficialis. All of these muscles originate primarily from the medial epicondyle of the humerus.

What is extensor compartment?

Anatomical terminology. Extensor tendon compartments of the wrist are anatomical tunnels on the back of the wrist that contain tendons of muscles that extend (as opposed to flex) the wrist and the digits (fingers and thumb). The extensor tendons are held in place by the extensor retinaculum.

What are the 6 dorsal compartments?

The dorsal extensor tendons pass under an extensor retinaculum and are divided into 6 compartments, as follows: Extensor pollicis longus tendon. Common finger extensors (extensor digitorum communis [EDC] tendon) dorsal to the capitotrapezoid articulation. Extensor digiti minimi tendon to the fifth digit.

Where are the muscles located in the hand?

Along with all of these muscles, the median and ulnar nerves, and ulnar artery are also enclosed in the tough antebrachial fascia that surrounds this compartment. Many of these muscles have tendons that enter the hand between the transverse carpal ligament and the carpal bones, in a space known as the carpal tunnel.

Which is part of hand is involved in compartment syndrome?

The hand compartments that may be involved in compartment syndrome are the interossei (both dorsal and palmar), the thenar and hypothenar, the adductor, and the fingers.

What are the three muscle compartments of the forearm?

Finally the deep group has three muscular components, flexor digitorum profundus, flexor pollicis longus, and pronator quadratus (image 3). Along with all of these muscles, the median and ulnar nerves, and ulnar artery are also enclosed in the tough antebrachial fascia that surrounds this compartment.

Where are the interossei muscles located in the hand?

The interossei muscles are located between the metacarpals. They can be divided into two groups: the dorsal and palmar interossei. In addition to their actions of abduction (dorsal interossei) and adduction (palmar interossei) of the fingers, the interossei also assist the lumbricals in flexion at the MCP joints and extension at the IP joints.